[Webkit-unassigned] [Bug 72078] [Chromium] Compositing with full sized fixed div causes heavy repaints

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https://bugs.webkit.org/show_bug.cgi?id=72078





--- Comment #2 from Xianzhu Wang <wangxianzhu at chromium.org>  2011-12-21 16:05:02 PST ---
Created an attachment (id=120232)
 --> (https://bugs.webkit.org/attachment.cgi?id=120232&action=review)
Test case with negative z-index

In my experiments, I must add a z-index CSS property with a negative value (like 'z-index: -100) to the #finalizer, does the issue occur.

Another experiment is to add 'top: 0px' to #finalizer, then the finalizer will be just under the other contents of the body. It's reasonable to repaint in this case when scrolling. So the excessive repaint might be because WebKit thinks #finalizer is overlapping with the whole body.

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